Documentation/Add installation and usage instructions.

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[codecov]

Codecov Report

Merging #4 (e117bc7) into main (4d6ab0f) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                main        #4   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        79        79           
===========================================
  Files              6         6           
  Lines            178       177    -1     
===========================================
- Hits             178       177    -1     

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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Impacted Files	Coverage Δ
src/Domain/Filter.php	100.00% <0.00%> (ø)

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